/* Base Styles */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Pretendard', sans-serif; color: #333; line-height: 1.6; background-color: #fff; scroll-behavior: smooth; }
ul { list-style: none; }
a { text-decoration: none; color: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
header { background: #fff; height: 80px; display: flex; align-items: center; border-bottom: 1px solid #eee; position: sticky; top: 0; z-index: 1000; }
header .container { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.logo a { font-size: 24px; font-weight: 800; color: #0056b3; }
nav ul { display: flex; gap: 30px; }
nav ul li a { font-weight: 500; transition: color 0.3s; }
nav ul li a:hover { color: #0056b3; }

/* Hero Rolling Banner */
.hero-section { position: relative; height: 600px; overflow: hidden; }
.slider-container { height: 100%; position: relative; }
.slide { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background-size: cover; background-position: center; opacity: 0; transition: opacity 0.8s ease-in-out; display: flex; align-items: center; justify-content: center; text-align: center; }
.slide.active { opacity: 1; }
.overlay { background: rgba(0, 0, 0, 0.4); width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.overlay h2 { color: #fff; font-size: 42px; line-height: 1.3; }
.overlay h2 strong { color: #00c3ff; }

.slider-dots { position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%); display: flex; gap: 10px; }
.dot { width: 12px; height: 12px; background: rgba(255,255,255,0.5); border-radius: 50%; cursor: pointer; }
.dot.active { background: #fff; width: 30px; border-radius: 10px; }

/* Content Sections */
.content-section { padding: 80px 0; }
.bg-light { background-color: #f8f9fa; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h3 { font-size: 32px; color: #0056b3; margin-bottom: 10px; }

.grid-row { display: flex; gap: 20px; flex-wrap: wrap; }
.grid-item, .card { flex: 1; min-width: 300px; padding: 40px; text-align: center; background: #fff; border: 1px solid #eee; display: flex; flex-direction: column; }
.equal-height .card { height: auto; } /* JS에서 높이 동기화 처리 */

.card img { max-width: 100%; height: 200px; object-fit: cover; margin-bottom: 20px; border-radius: 8px; }

/* Process */
.process-steps { display: flex; justify-content: space-between; gap: 10px; }
.step { text-align: center; flex: 1; }
.step span { display: inline-block; width: 60px; height: 60px; line-height: 60px; border-radius: 50%; background: #0056b3; color: #fff; font-weight: bold; margin-bottom: 15px; }

/* Footer */
footer { background: #333; color: #fff; padding: 40px 0 20px; font-size: 14px; }
.footer-info { margin-bottom: 20px; line-height: 1.8; opacity: 0.8; }
.copyright { text-align: center; border-top: 1px solid #444; padding-top: 20px; width: 100%; }

/* Scroll Top Button */
#scrollTopBtn { position: fixed; bottom: 30px; right: 30px; display: none; padding: 10px 15px; background: #0056b3; color: #fff; border: none; border-radius: 5px; cursor: pointer; z-index: 99; }

/* Responsive */
@media (max-width: 768px) {
    .overlay h2 { font-size: 28px; }
    .process-steps { flex-direction: column; gap: 30px; }
    nav ul { display: none; }
}